16987381977 has 16 divisors (see below), whose sum is σ = 22770708480. Its totient is φ = 11264643600.

The previous prime is 16987381861. The next prime is 16987381981. The reversal of 16987381977 is 77918378961.

It is not a de Polignac number, because 16987381977 - 2¹⁶ = 16987316441 is a prime.

It is a super-2 number, since 2×16987381977² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16987381277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427902 + ... + 465912.

It is an arithmetic number, because the mean of its divisors is an integer number (1423169280).

Almost surely, 2^16987381977 is an apocalyptic number.

It is an amenable number.

16987381977 is a deficient number, since it is larger than the sum of its proper divisors (5783326503).

16987381977 is a wasteful number, since it uses less digits than its factorization.

16987381977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38804.

The product of its digits is 32006016, while the sum is 66.

The spelling of 16987381977 in words is "sixteen billion, nine hundred eighty-seven million, three hundred eighty-one thousand, nine hundred seventy-seven".